Suction cleaning mechanism for printing-presses.



B. D. STEVENS.

SUGTIONCLEANING MECHANISM FOR PRINTING PBESBES.

APPLIOATIOEIILBD snmaa. 1013.

Emma M113 12,1914;

WP/22.60. \wr F wm 1 earns BURT D. STEVENS, 0F RIVERSIDE, ILLINOIS, ASSIGlhlOE T0 EEKE MIEHLE PRINTING PRESS 6t MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SUCTION CLEANING MECHANISM FOR PRINTINGPRESSES.

To all whom it mag/concern Be it known that I BURT D1 S'rnvnNs, a citizen of the United States, residim at Riverside, in the county of Cook and btate of Illinois, have invented certain new and useful Improvements in Suctlon Cleaning Mechanism for Printing-Presses, of which. the folldwing is a specification.

The paper sheet as it reaches the press has upon its surface a considerable amount of dust such as paper fuzz which fills the type faces and otherwise interferes with the obtaining of a clear cut impression. It has been proposed to remove this dust previous to the printing operation by wi ing devices, brushes and by currents of air ut' the conditions prevailing in connection with the o eratio of printing presses and particu arly of two-revolution presses have rendered these expedients as heretofore devised far from satisfactory.

' The present invention has for its primay object the provision of a suction cleaning device acting' upon the paper before printing which device is so arranged as not to interfere with the feed or deliveryand not to require to be intermittently cut out of action as has heretofore been the case.

A further object of the invention is the em 10 meht of asuction device to perform a dan le service in clearing out or removal of the dust and shreds due to the slitting of the paper as it leaves the press,

With these objects'in view the suction device is arranged adjacent the cylinder periphery at a point immediately beyond the delivery and slitting mechanism instead 'of between the feed and delivery so that while the sheet of paper held by the grippers passes through the space between the feed and delivery twice in a two-revolution press it passes the suction device but once and the latter does not therefore need to.be cut out of operation at all as would be the case if the suction cleaiiing device were arranged between the feed and delivery. This location of the suction cleaning device also onables it to act simultaneously upon both the surface of the paper on the press and the trough of the slitting mechanism whereby both are kept clean.

In order that the invention may be readily understood a preferred embodiment of the same is set forth in I the accompanying spectficatlon of Lettgslat'cnt. ltlay 12, 1914. Application filed September 8, 1918. Serial Ho. 788,568.

drawing and in the description based thereon. 8, however, the iny'ention is capable of embodiment in other constructional forms the drawing and description are to be construed in an illustrative and not in an unnecessarily limiting sense.

In the drawing F igure 1 is a schematic view partly in section illustrating the invention as applied to a two-revolution press; and F ig. 9 is a fragmentary view of the mouth of the suction tube with its guard.

Herein the reference numeral 11 designates generally a printing cylinder and 12 the bed of a two-revolution press, the feed being shown at 13 and the delivery at 1-1. In a press of this character the sheet of paper 15 is received from the feed by the grippers 16 and carried around with the cylinder receivin its impression from the bed 12 after whic it again passes under the feed, traverses the space between the feed and delivery a second time and is removed from the cylinder by the delivery. As the sheet leaves the press it is slit by the slitting mechanism, indicated at 17, at the delivery point, the shreds of paper and the likecol- *lecting within the trough 17 from which it has usually been removed at intervals by hand.

In order to clean the sheet of paper from any dust adhering to the surface thereof and also to remove the dust and shreds from the litting ti'ough I arrange at a point below the slitting mechanism a suction device ineluding a draft tube 18 having two branches 19 and 20, the branch 19 having its mouth arranged within the slitting trough 17 for removing the dust therefrom and the branch 20 having its mouth disposed adjacent. the cylinder periphery to act upon the paper 15 in its path at a point immediately be yond -t ht', .delivery. The lower wall of the branch tube 20 is cut away slightly so as to permit the air to enter the tube in a direction counter to that of the movement of the paper across its mouth and. in order to prevent the paper being sucked into the tube the mouth of the latter is protected by a grid comprising wires 21. extending across the same and also across the cut-away portion provided for the entry of the air.

It will thus be observed that the paper as it passes from the feed to the printing position is subject to the cleaning action of the suctionldevice and as it passes upon the next revolution to the delivery it is slit and the resultant shred dust is carried 0E from the slitting ltroughby the second mouth of the same suction device.

At each alternate revolution of the cylinder 1.]. the suction device acts upon the bare face of the cylinder, there being no paper held by the grippers, and the action of the suction device is incii'ective, but non injurious, Whereas if thesuction device were arranged in advance of' the delivery between the same and the feed the paper would pass in front of the suction mouth before being printed and also after printing before delivery which would necessitate the cutting of the suction cleaning device out of operation because of its injurious effect upon the freshly printed sheet.

I claim:

1. The combination with the cylinder of a printing press, the feed, and the delivery, of a suction cleaning device arranged to act uponthe paper carried by the cylinder at a point beyond the delivery, said device including a draft tube having a mouth terinitiating adjacent the cylinder periphery, and a grid over said mouth, the rear lip of the mouth cut away topermit the entry of air in a direction counter to the movement of the cylinder, substantially as described.

2. The combination with the cylinder of a two-revolution printing press, the feed, and the delivery, of a suction cleaning device arranged to act upon the paper carried by the cylinder at a point beyond the delivery, said device including a draft tube having its mouth terminating adjacent the cylinder, the rear lip of the mouth cut away to permit the entry of air ina direction counter to the movement of the cylinder, substantially as described.

3. The combination with the cylinder of a printing press, the feed, the delivery, and slitting mechanism, of a suction cleaning device arranged to act upon the paper carried by the cylinder at a point beyond the delivery and also upon the slitting: mecha-- nism, substantially as described.

4. The combination with the cylinder of a printing press, the feed, the delivery, and slitting mechanism, of a suction cleaning device arranged to act upon the paper carried by the cylinde' at a point beyond the dclivery and also upon the slitting" mechanism, said device including a draft tube having two months disposed one adjacent the cylinder periphery and the other adjacent the slitting mechanism, substantially as described.

The combination with the cylinder of a printingpress, the feed, the delivery, and slitting mechanism, of a suction cleaning device arranged to act upon the paper carried by the cylinder at a point beyond the delivery and also upon the slitting mechanism, said device including a draft tube having two months disposed one adjacent the cylinder periphery and the other adjacent the slitting mechanism, and a Wire grid over the first named mouth, substan tially as described.-

6. The combination with the cylinder of a printing press, the feed, the delivery, and slitting mechanism, of a suction cleaning device arranged to act upon the paper carried by the cylinder at a point beyond the delivery and also upon the slitting; mechanism, said device including a draft tube having two months disposed one adjacent the cylinder periphery and the other adjacentthe slitting mechanism, the rear lip of the first named mouth cut away to permitthe entry of-air in a direction counter to the move- BURT D. STEVENS.

as de- Witnesses LEWIS T. GREIST, CLARA DoNNnLLY. 

